194 



286. TIN CHLORIDE. Sn C1 2 . (Stannous Chloride, Bichloride of Tin."} 



a. Anhydrous, in grey lumps. 



I. Hydrated, in crystals. Sn C1 2 , 2 H 2 0. (Tin Salt.) 



c. Ditto, pure. 



287. IODIDE. SnI 2 . 



a. Crystals. 



288. OXIDE. Sn 0. (Stannous Oxide. Monoxide of Tin.) 



a. Black powder. 



289. DIOXIDE. Sn 2 . 



a. Native, in sandy grains. (Stream Tin Ore.) 



Note. For specimens of tin-stone or cassiterite, which is a native 

 oxide of tin, see Case No. 8. 

 Note. Specimen a contains zircon and spinelle, as well as oxide of tin. 



b. Yellowish-grey powder. (Putty Powder.) 



Note. This specimen was prepared by heating tin in contact with air. 



c. In white powder, pure, hydrated. Sn 2 , 2 H 2 0. 



290. BISULPHIDE. Sn S 2 . (Mosaic Gold, Aurum Musivum.) 



a. Pearly crystalline scales. 



TITANIUM. . Ti. 



291. OXIDE. Ti0 2 . (Titanic Acid.) 



t a. White powder. 



LEAD. Pb. 



292. METALLIC. 



a. With crystalline surface. 



b. In thin sheets. 



c.' Granulated, obtained in Pattinson's process of desilver- 

 ing lead. 



293. ACETATE. Pb (C 2 H 3 2 ) 2 , 3H 2 0. (Plumbic Acetate.) 



* a. Mass of crystals. 



* b. Ditto, of larger crystals. 



c. Crystalline lumps, commercial specimen, not quite 



pure. (Sitgar of lead.) 



d. Crystals, pure. (Plumbi Acetas, B.P.) 



294. CARBONATE. PbC0 3 . (White Lead.) 



N a. White powder. 



b. Specimen illustrating the formation of the carbonate 

 from bars of the metal. 



